django-collect-offline-files 0.1.21

Add file-based data transfer to server for offline-use

django-collect-offline-files

Transfer django_collect_offline transactions as files using SFTP over an SSH connection.

Data flows from client to server where a server is either a node server or the central server.

see also django_collect_offline.

Usage

On the client:

python manage.py export_transactions

On the server or receiving host:

python manage.py incoming_observer

python manage.py deserialize_observer

FileQueueObservers

Two FileQueueObservers do the work using use watchdog observers; IncomingTransactionsFileQueueObserver and DeserializeTransactionsFileQueueObserver. They are called using management commands:

python manage.py incoming_observer

and

python manage.py deserialize_observer

IncomingTransactionsFileQueueObserver

The client exports data to JSON and sends to the server. Using TransactionExporter, data is exported into a JSON file from django_collect_offline.models.OutgoingTransaction on the client and sent to the server using TransactionFileSender.

Once a file is sent to the server, the IncomingTransactionsFileQueueObserver detects it and adds the filename to the queue (IncomingTransactionsFileQueue).

DeserializeTransactionsFileQueue

Processed files in the queue IncomingTransactionsFileQueue are moved to the pending folder watched by DeserializeTransactionsFileQueueObserver.and added to the its queue, DeserializeTransactionsFileQueue.

Processing queue items / filenames

Each queue has a processor, (see process_queue). The processor calls the next_task method for each item in the queue in FIFO order infinitely or until it gets a None item.